Seen Clomid is a pharmaceutical drug that requires a prescription in a lot of countries, I don't know that it really fits the bill as a OTC natural supplement.
But taking large doses of DAA, ZMA or Tribulus isn't realy natural in some ways either.
I've taken Tribulus previously, didn't think much of it.
I just had bloods taken the other day and then started taking DAA, ZMA and Tribulus. I start taking YK-11 tomorrow, going to be interesting at next blood test in 4 weeks as to which happens:
1) Yk-11 shuts me down and I have to add testosterone.
2) YK-11 doesn't shut me down, but testosterone levels stay the same because DAA, ZMA and Tribulus don't do crap all.
3) YK- 11 doesn't shut me down and the DAA, ZMA and Tribulus raise my testosterone levels.
Only the bloods will answer the question. I'm betting on situation 1 or 2.